| /* |
| * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| /* |
| * @test |
| * @bug 7190310 |
| * @summary Inlining WeakReference.get(), and hoisting $referent may lead to non-terminating loops |
| * @run main/othervm/timeout=600 -Xbatch Test7190310 |
| */ |
| |
| /* |
| * Note bug exhibits as infinite loop, timeout is helpful. |
| * It should normally finish pretty quickly, but on some especially slow machines |
| * it may not. The companion _unsafe test lacks a timeout, but that is okay. |
| */ |
| |
| import java.lang.ref.*; |
| |
| public class Test7190310 { |
| private static Object str = new Object() { |
| public String toString() { |
| return "The Object"; |
| } |
| |
| protected void finalize() throws Throwable { |
| System.out.println("The Object is being finalized"); |
| super.finalize(); |
| } |
| }; |
| private final static ReferenceQueue<Object> rq = |
| new ReferenceQueue<Object>(); |
| private final static WeakReference<Object> wr = |
| new WeakReference<Object>(str, rq); |
| |
| public static void main(String[] args) |
| throws InterruptedException { |
| Thread reader = new Thread() { |
| public void run() { |
| while (wr.get() != null) { |
| } |
| System.out.println("wr.get() returned null"); |
| } |
| }; |
| |
| Thread queueReader = new Thread() { |
| public void run() { |
| try { |
| Reference<? extends Object> ref = rq.remove(); |
| System.out.println(ref); |
| System.out.println("queueReader returned, ref==wr is " |
| + (ref == wr)); |
| } catch (InterruptedException e) { |
| System.err.println("Sleep interrupted - exiting"); |
| } |
| } |
| }; |
| |
| reader.start(); |
| queueReader.start(); |
| |
| Thread.sleep(1000); |
| str = null; |
| System.gc(); |
| } |
| } |
| |